摘要
为了给火电厂砷污染控制提供基础数据,有必要了解煤中砷的存在形态。采用逐级化学顺序提取法对5种煤样中不同赋存形态的砷进行浸提,分别得到非特异性吸附态砷、特异性吸附态砷、无定形和弱结晶铁铝水合氧化物结合态砷、全结晶铁铝水合氧化物结合态砷及残渣态砷。提取液中的砷采用氢化物发生-原子荧光光谱法进行测定。结果表明,不同煤样具有不同的砷形态分布特征,砷主要以无定形和弱结晶铁铝水合氧化物结合态及残渣态2种形式存在;各煤样不同形态As含量的总和与煤样经硝酸消解后测得的总As含量基本吻合,说明煤中As在浸提过程中无明显损失,证明所采用的方法及操作得当。
It is necessary to understand the existing forlns of arsenic in power plant coals so as to provide some basic data to bridle arsenic pollution caused by power plants. Sequential chemical extraction procedure was adopted to extract the arsenic, in various forms from five coal samples, which are namely to be obtained as non-specific adsorbed arsenic, specific adsorbed arsenic, amorphous and weak crystalline iron and aluminum hydrous oxides arsenic, crystalline iron and aluminum hydrous oxides arsenic and residue arsenic. The contents of arsenic in various extraction liquids were determined by atomic fluorescence spectrometer. The results show that the distributions of arsenic are different in the different coal samples. Arsenic mainly exists in amorphous and weak crystalline iron and aluminum hydrous oxides arsenic form and residue arsenic form. The total amount of arsenic in different coal samples is ahnost consistent with that measured in the coal samples digested by HNO3, which demonstrates that there is no significant loss of arsenic in coals during the extraction prncess and the method and operation adopted are proven to be appropriate.
出处
《中国电力》
CSCD
北大核心
2013年第9期142-144,159,共4页
Electric Power
基金
中央高校基本科研业务费专项资金资助项目(11ZG13)
教育部新世纪优秀人才支持计划资助项目(NCET-10-0341)
河北省自然科学基金资助项目(B2010001676)
关键词
煤
砷
形态分析
顺序提取
原子荧光光谱法
coal
arsenic
speciation analysis
sequential extraction
atomic fluorescence spectrometry
